This multiplayer beta will come in four forms -- according to a post on the PlayStation Blog. The first wave hit on March 15 but was only open to a select few that developer Zipper Interactive contacted. On March 22, PlayStation Plus members can get in on the action. If you got one of those codes from Killzone 3, you can participate in the beta starting on March 29. And if none of that applies to you, you can get general admission on April 5.

The beta will run until April 13. Then, the servers get shut down until SOCOM 4: U.S. Navy SEALs releases on April 19, 2011. Until then, keep checking IGN for all your SOCOM 4 news and info.